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我遇到了以下代码的问题。类ID是Long,B类id是嵌入式ID,其中一个字段是A类。Hibernate子查询上的ClassCastException
DetachedCriteria dc = DetachedCriteria.forClass(A.class,"a").setProjection(Property.forName("a.id"));
Criteria cr= this.sessionFactory.getCurrentSession().createCriteria(B.class,"b").add(Subqueries.in("b.id.a.id", dc));
List<B> bb = cr.list();
这给了异常:
java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Long
但这:
List<Long> dd = this.sessionFactory.getCurrentSession().createCriteria(A.class,"a").setProjection(Property.forName("a.id")).list();
Criteria cr= this.sessionFactory.getCurrentSession().createCriteria(B.class,"b").add(Restrictions.in("b.id.a.id", dd));
List<B> bb = cr.list();
作品。我究竟做错了什么?